Effective Time Period?
Advantage is only effective for 30 days. After this time it is unlikely to have any affect at all, so you must factor in repeat treatments every month. The alternative, Frontline however is guaranteed to work for a month too. But, its different composition means that often it will remain effective killing new fleas and ticks for up to ten weeks. This is not just anecdotal evidence either. Studies by the manufacturers confirm many pet owners need use Frontline between every four to ten weeks. The variation in time scale of effectiveness is based on the flea and tick population in your region and the activity of the cat involved.
